Signal transmission system

ABSTRACT

A liquid crystal display of compact size is disclosed. The liquid crystal display has a tape carrier package and a single integrated PCB for processing a gate driving signal and data driving signal. The tape carrier package includes a base substrate, a gate driver IC formed on said base substrate, an input pattern formed on said base substrate that applies gate driving signals input from an external device to the gate driver IC, a first output pattern formed on said base substrate that outputs a first gate driving signal processed in said gate driver IC, and a second output pattern formed on said base substrate, that outputs a second gate driving signal bypassing the gate driver IC among the gate driving signals.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a divisional application of the U.S. patentapplication Ser. No. 09/551,404 filed Apr. 17, 2000 now U.S. Pat. No.6,639,589.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a tape carrier package for a compactsize liquid crystal display (LCD), and more particularly to a tapecarrier package (TCP) capable of receiving both of gate signal and datasignal which are processed in a single integrated printed circuit boardand transmitting the processed signals to an LCD panel and another TCP.Further, the invention relates to a liquid crystal display panel towhich the tape carrier package is applied.

2. Description of the Related Art

Generally, an LCD is a mostly used type of flat panel display.Especially, the small size, lighter weight and lower power consumptionrender the LCD to replace the traditional cathode ray tube (CRT). TheLCD is currently used as a monitor for a lap-top computer and even for adesktop computer, gaining its popularity.

As shown in FIG. 1, an LCD includes an LCD panel 101 and a light supplyunit. The LCD panel 101 includes a TFT substrate 10, a color filtersubstrate 20, multiple gate TCPs 30 connected to gate lines (not shown)of the TFT substrate 10, multiple PCB 50, gate PCB 50 and data PCB 60need connectors 55 and 65.

The connectors 55 and 56 are generally installed on the front surface oron the rear surface of the PCBs 50 and 60. This increases the thicknessof the LCD and makes it difficult to achieve a compact size LCD.

And the flexible printed circuit (FPC) 70 that connects the connector 55and the connector 65 complicates the assembly process and increases thefabrication costs.

Finally, a bent type PCB that is mostly used currently bends a gate PCB50 and data PCB 60 and they are fixed at the rear surface of thereflecting plate of a backlight assembly. In such a configuration, thedata PCB 60 is put in a space between a relatively thin side edge 92 ofthe non-symmetric light guiding plate 90 and the mold frame. Thus thedata PCB 69 does not increase the thickness of the LCD much. On theother hand, the gate PCB 50 is put in a space between a thicknessvarying side of the light guiding plate 90, and the mold frame.Specifically, one side of the gate PCB 50 is attached to a thick portionof the rear surface of the light guiding plate 90, making a thick LCDdepending on the thickness of the light guiding plate 90.

SUMMARY OF THE INVENTION

The present invention is to provide an integrated PCB that has a gatePCB and a data PCB on one board and is capable of allowing drivingsignals to be applied to gate lines and data lines without usingadditional connectors and flexible printed circuits.

It is another object of the present invention to allow a tape carrierpackage that receives a driving signal from the integrated PCB totransmit the received driving signal into another tape carrier package.

It is yet another object of the present invention to prevent delays ofdriving signals when a driving signal processed in the integrated PCB issent to gate lines or data lines via tape carrier packages.

It is still another object of the present invention to provide animproved assembly between tape carrier packages and TFT substrate,thereby attaining an easy carrying and decreasing the thickness of thepanel.

To achieve these and other advantages in accordance with the purpose ofthe present invention as embodied and broadly described, a tape carrierpackage comprises a base substrate, a gate driver IC formed on the basesubstrate, an input pattern formed on the base substrate that suppliesgate driving signals input from an external device to the gate driverIC, a first output pattern formed on said base substrate that outputs afirst gate driving signal processed in the gate driver IC, and a secondoutput pattern formed on said base substrate, that outputs a second gatedriving signal bypassing the gate driver IC among the gate drivingsignals.

Also a liquid crystal display panel assembly and a liquid crystaldisplay using such an assembly are disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

The above objects and other advantages of the present invention willbecome more apparent by describing in detail a preferred embodiment withreference to the attached drawings in which:

FIG. 1 is a perspective view showing a conventional liquid crystaldisplay panel;

FIG. 2 is an exploded perspective view of the liquid crystal displayaccording to a preferred embodiment of the present invention;

FIG. 3 is a perspective view of the liquid crystal panel according to apreferred embodiment of the present invention;

FIG. 4 is a partially exploded perspective view of the liquid crystaldisplay panel according to a preferred embodiment of the presentinvention;

FIG. 5 is a schematic view for describing an operation of the liquidcrystal display panel according to a preferred embodiment of the presentinvention;

FIG. 6 is a perspective view showing an assembly of tape carrier packageand TFT substrate of the liquid crystal display panel according to apreferred embodiment of the present invention;

FIG. 7 is a sectional view taken along the line 7–7′ of FIG. 6; and

FIG. 8 is a partial sectional view of the liquid crystal displayaccording to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings.

Hereinafter, a liquid crystal display panel, a tape carrier package anda liquid crystal display according to the present invention aredescribed more fully with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view of the liquid crystal displayaccording to a preferred embodiment of the present invention.

The liquid crystal display 601 comprises a liquid crystal display panelassembly 200, a back light assembly 300, a chassis 400 and a cover 500.

The back light assembly 300 is comprised of optical sheets 310, a lightguiding plate 320, a lamp assembly 330, a light reflecting plate 340 anda mold frame as a receiving container.

Hereinafter, the liquid crystal display panel assembly 200 according tothe present invention is described referring to the FIG. 3 and theliquid crystal display panel is then described more fully referring toFIG. 4.

Referring to FIG. 3, the liquid crystal display panel assembly 200comprises a liquid crystal display panel 202 having a TFT substrate 240and a color filter substrate 250, a liquid crystal (not shown)interposed between the TFT substrate 240 and the color filter substrate250, tape carrier packages 210 and 220 and a single integrated PCB 260.

Referring to FIG. 4, the liquid crystal display panel 202 comprises aTFT substrate 240 and a color filter substrate 250. The filter substrate250 is smaller than the TFT substrate 240 and faces the TFT substrate240. The TFT substrate 240 includes a gate line 241, a data line 242, athin film transistor (not shown) and a pixel electrode (not shown).

The tape carrier packages 210, 210′, 226, and 229 are electricallycoupled to the TFT substrate 240 and includes gate tape carrier packages210 and 210′ and data tape carrier packages 226 and 229. The gate tapecarrier packages 210 and 210′ are connected to the gate lines on the TFTsubstrate 240. The data tape carrier packages 226 and 229 are connectedto the data lines.

The single integrated PCB 260 that is electrically connected to the tapecarrier packages 226 and 229 has various driving elements for processinggate driving signals and data driving signals. The gate driving signalsare input to the gate tape carrier package 210 and the data drivingsignals are input to the data tape carrier package 220.

The color filter substrate 250 includes a transparent glass substrate250. The transparent glass substrate 250 has a lattice type black matrix(not shown), an RGB pixel (not shown) and a transparent and conductiveITO (Indium Thin Oxide) electrode. Here, the RGB pixels are formed bypattering a photoresist mixed with RBG pigment. The ITO electrodefunctions as a common electrode.

Meanwhile, the TFT substrate 240 includes a transparent glass substrate.On the transparent glass substrate, a plurality of thin film transistors(not shown) each including a gate, a source, and a drain are formed in amatrix arrangement by the semiconductor thin film formation process.

Gate terminals of all the thin film transistors in a row are connectedto a gate line 241 that is extended to an end of the one side of the TFTsubstrate 240. Source terminals of all the thin film transistors in onecolumn are connected to a data line 242 formed at an end of the otherside of the TFT substrate 240. The drain terminal of each thin filmtransistor is connected to an ITO electrode, which is a pixel electrode.Therefore, the ITO electrode faces the common electrode of the colorfilter substrate 250.

Further, the gate lines 241 are disposed in an effective display region243 at the same interval with respect to each other while they aredisposed in a perimeter region with a smaller interval than the intervalof the gate line of the effective display region 243, i.e., the gatelines 241 in the perimeter region are concentrated towards outputterminals of the TCPs 210 and 210′.

The preferred embodiment of the present invention has three gate linegroups, although FIG. 4 shows only two gate line groups 245.

Also, the data lines 242 are disposed in the effective display region243 at the same interval with respect to each other. The data lines 242are collected toward output terminals of the TCPs 226 and 229 on theperimeter region 244 and form a data line group 246 on the perimeterregion 244 and connected to the data tape carrier packages 226 and 229.

The preferred embodiment of the present invention has six data linegroups and FIG. 6 shows only two data line groups 246.

Some lines of a gate line group 245 placed at one edge and some lines ofa data line group 246 placed at one edge around a corner of the TFTsubstrate 240 are connected to each other, thereby forming a first gatedriving signal transmission line 247.

One end of the first gate driving signal transmission line 247 extendsto one side of the TFT substrate 240 in which the end of the outermostgate line group 245 is formed. The other end of the first gate drivingsignal transmission line 247 extends to one side of the TFT substrate240 in which the end of the outermost data line group 246 adjacent tothe gate line group 245 is disposed.

In the first gate driving signal transmission line 247, an inputterminal 247 a that receives a signal is defined as one end portion ofthe first gate driving signal transmission line 247 at the side of theTCP 226. And an output terminal 247 b is defined as the other end of thefirst gate driving signal transmission line 247 at the side of the TCP221.

Meanwhile, a second gate driving signal transmission line 248 is formedat the space between the two gate line groups 245.

One end of the second gate driving signal transmission line 248 isformed at one side of the TFT substrate 240 and extends to a desiredlength in parallel with the gate line group 245. The second gate drivingsignal transmission line 248 is bent perpendicularly to the adjacentgate line group 245 and extends again to a desired length. And thesecond gate driving signal transmission line 248 is then bent to beparallel with the adjacent gate line group 245 and extends to the otherside of the TFT substrate 240.

At this time, an input terminal 248 a is defined as one end portion ofthe second gate driving signal transmission line 248 and an outputterminal 248 b is defined as the other end portion of the second gatedriving signal transmission line 248.

The gate tape carrier packages 210 and 210′ and data tape carrierpackages 226 and 229 will be described more fully referring to the FIG.4.

The gate tape carrier package 210 is comprised of a FPC 211, a gatedriver IC 212, a gate driving signal input pattern 213, a first gatedriving signal output pattern (or a bypass line) 214, a second gatedriving signal output pattern 215.

The gate driver IC 212 is disposed at the rear surface of the FPC 211 ina flip chip type manner. The second gate driving signal output pattern215 is disposed at the FPC 211 on which the gate driver IC 212 isdisposed. One end of the second gate driving signal output pattern 215is connected with output terminals of the gate driver IC 212 and theother end of the second gate driving signal output pattern 215 isconnected through an anisotropic conductive film 270 to the gate linegroup 245.

The gate driving signal input pattern 213 receives the gate drivingsignal from the output terminal 247 b of the first gate driving signaltransmission line 247 and sends the signal to the gate driver IC 212.

Thus, one end of the gate driving signal input pattern 213 is connectedthrough the anisotropic conductive film 270 to the output terminal 247 bof the first gate driving signal transmission line 247 and the other endof the gate driving signal input pattern 213 is connected to the inputterminals of the gate driver IC 212.

The first gate driving signal output pattern 214 relays the gate drivingsignal from the TCP 226 to the input terminal 248 a of the second gatedriving signal transmission line 248 formed between the gate line groups245.

To realize this, one end of the first gate driving signal output pattern214 is connected through the anisotropic conductive film 270 to theinput terminal 248 a of the second gate driving signal transmission line248 and the other end the first gate driving signal output pattern 214is connected to the output terminal 247 b of the first gate drivingsignal transmission line 247.

At this time, the first gate driving signal output pattern 214 and thegate driving signal input pattern 213 are formed to be symmetric withrespect to the gate driver IC 212.

If an output enable signal (OE signal) is ON, the gate driving signal,which is input through the gate driving signal input pattern 213 to thegate driver IC 212, is processed in the corresponding gate driver IC212, and then applied to the second gate driving signal output pattern215. If the OE signal is OFF, the gate driving signal is not applied tothe second gate driving signal output pattern 215 but to the first gatedriving signal output pattern 214.

Meanwhile, the data tape carrier package includes a plurality ofpackages, i.e., a dual functioning tape carrier package 226 forprocessing the gate driving signals and the data driving signals and asingle functioning tape carrier package 229 only for the data drivingsignal.

Referring to FIG. 4, the dual functioning tape carrier package 226 forgate/data driving signals comprises a FPC 221 that is a flexible basefilm 221, the gate driving signal transmission pattern 223, a datadriver IC 222, a data driving signal input pattern 224 and a datadriving signal output pattern 225.

Further, the data driver IC 222 is disposed at the rear surface of theFPC 221 in a flip chip type manner. One end of the data driving signalinput pattern 224 is connected to input terminals of the data driver IC222. And the other end of the data driving signal input pattern 224 isconnected to the single integrated PCB 260.

In addition, one end of the data driving signal output pattern 225 isconnected to output terminals of the data driver IC 222, and the otherend of the data driving signal output pattern 225 is connected through aanisotropic conductive film 270 to the aforementioned data line group246.

On the FPC 221 of the dual functioning tape carrier package 226 for thegate/data driving signals, there are formed the data driving signaloutput pattern 225, the data driving signal input pattern 224, the datadriver IC 222 and the gate driving signal transmission pattern 223 thatis separate from the data driver IC 222.

One end of the gate driving signal transmission pattern 223 is connectedto the single integrated PCB 260. And the other end of the gate drivingsignal transmission pattern 223 is connected through the anisotropicconductive film 270 to the input terminal 247 a of the first gatedriving signal transmission line 247.

Meanwhile, the single functioning tape carrier package 229 comprises aFPC 227, a data driver IC 222, a data driving signal input pattern 224′and a data driving signal output pattern 225′.

One end of the data driving signal input pattern 224′ is connected tothe single integrated PCB 260. And the other end of the data drivingsignal input pattern 224′ is connected to input terminals of the datadriver IC 222. One end of the data driving signal output pattern 225′ isconnected to output terminals of data driver IC 222. And the other endof the data driving signal output pattern 225′ is connected through theanisotropic conductive film 270 to the data line group 246.

Therefore, the gate driving signal generated from the single integratedPCB 260 is input through the gate driving signal transmission pattern223 of the dual functioning tape carrier package 226 for the gate/datadriving signal, the input terminal 247 a of the first gate drivingsignal transmission line 247, the output terminal 247 b of the firstgate driving transmission line 247 and the gate driving signal inputpattern 213 of the gate tape carrier package 210 to the gate driver IC212. The gate driving signal is then input through the second gatedriving signal output pattern 215 to the gate line group 245 by the OEsignal. Meanwhile, some of the gate driving signal generated from thesingle integrated PCB 260 are input through the first gate drivingsignal output pattern 214 to the gate driving signal input patter 213′or the first gate driving signal output pattern 214′ of the adjacent TCP211′.

The signals that come from the single integrated PCB 260 through theabove passages to the gate line group 245 are a gate clock, the OEsignal, a V_(ON) signal which is a turn-on signal of the thin filmtransistor and a V_(OFF) signal which is a turn-off signal of the thinfilm transistor.

In addition, the data driving signal generated from the singleintegrated PCB 260 is input through the tape carrier package 221 for thegate/data driving signal and the single functioning tape carrier package229 only for the data driving signal to the data line group 246 of theTFT substrate 240.

The signals input from the single integrated PCB 260 through the datadriving signal input patterns 224 and 224′, the data driver IC 222 andthe data driving signal output patterns 225 and 225′ to the data linegroup 246, are a STH (Start Horizontal) signal for exactly latching acolor data from an outer data processing unit to the data driver IC 222,a LOAD signal which outputs the signal latched in the data driver IC 222to the liquid crystal display panel assembly 200, a clock signal fortransmitting the data and RGB color data, etc.

Next, operations of the liquid crystal display according to the presentinvention are described with reference to the accompanying drawings.

Video signals as well as electric power, control signals, and color dataare input from an external information processing unit to the singleintegrated PCB 260. The single integrated PCB 260 then generates gatedriving signals and data driving signals depending on the input videosignals. Thereafter, the data driving signals generated from the singleintegrated PCB 260 are respectively input into the respective datadriver IC 222 and 222′ via the data driving signal input patterns 224and 224′ of data driving signal transmission lines of the dualfunctioning tape carrier package 226 and the single functioning tapecarrier package 229. The processed data driving signals are loaded toselected data lines 242 of the data line group 246 via the data drivingsignal output patterns 225 and 225′. At this time, gray scale voltagesfor displaying colors are also applied to respective data lines 242.

Simultaneously, among gate driving signals processed in the singleintegrated PCB 260, a gate voltage is sent to an input terminal 247 a ofthe first gate driving signal transmission line 247 through the gatedriving signal transmission pattern. One component of the gate drivingsignals is a gate voltage. The gate voltage goes along the first gatedriving signal transmission line 247 and then is sent to the inputterminal of the gate driving signal input pattern 213.

The driving signals inputted to the gate driving signal input pattern213 are also transferred into the gate driving signal input pattern 213′of the adjacent gate tape carrier package 210′ through the first gatedriving signal output pattern 214 connected to the input terminal of thegate driving signal input pattern 213 and the input terminal 248 a ofthe second gate driving signal transmission line 248 printed on the TFTsubstrate 240. By such signal transmissions, all the gate driver IC 212and 212′ are prepared to apply the gate driving signals to the gatelines by the OE signal.

Next, the OE signal is carried in or carried out into the gate driverICs 212 and 212′ via the gate driving signal pattern 223 of the TCP 226,the first gate driving signal transmission line 247, the gate drivingsignal input pattern 213, and the second gate driving signaltransmission line 248 in the named order and thereby pre-designated gatevoltages, such as turn-on voltage Von and turn-off voltage Voff areapplied to all of the gate lines within a period of one frame.

As the Von signal is input into gate terminals of thin film transistorsplaced along the rows through the gate lines 241, the thin filmtransistors are all turned on and the gray scale voltages which has beenalready applied to the data lines 242 are applied to the pixelelectrodes. This generates an electric field proportional to the grayscale voltage, between the pixel electrode and the common electrode.

As the voltages are applied to the pixel electrodes, the liquid crystalinterposed between the pixel electrode and the common electrodere-arranges and the light transmittance changes accordingly. As aresult, lights may pass through the TFT substrate 240 depending on thelight transmittance. Thereafter, the lights pass through gray scale. Inother words, both of the gate driving signal delay and the modulation inthe turn-on and turn-off voltages significantly degrades the picturequality and display colors.

In order to prevent the gate driving signal transmission delay and themodulation of the turn-on voltage and the turn-off voltage, theresistance between the transmission pattern and the transmission linesneeds to be decreased. The resistance can be theoretically decreased byenlarging the sectional area of the gate driving signal transmissionline and the gate driving signal pattern or sufficiently widening theinterval between the gate driving signal transmission lines.

However, such a conventional wisdom consumes the scarce resource of realestate on the TFT substrate 240, making it more difficult to produce acompact and lighter LCD product.

Accordingly, several preferred embodiments are disclosed to resolve suchdrawbacks. They are described with reference to the accompanying drawingof FIG. 5.

As described referring to FIGS. 2 to 6, the first gate driving signaltransmission line 247, the gate driving signal transmission pattern 223,the gate driving signal input pattern 213, the first gate output pattern214 are grouped in plurality. For example, three gate driving signalline groups comprise a first gate driving signal line group 281, asecond gate driving signal line group 282, and a third gate drivingsignal line group 283. Each of the three groups has a plurality ofsignal transmission lines.

A plurality of gate driving signals are transferred through therespective the RGB elements formed on the color filter substrate 250 anddisplays an image. At this time, the electric field between the pixelelectrode and the common electrode is maintained for a period of oneframe in which all the gate lines 241 are turned on in order.

The above-described operations are performed very quickly and, thus, theliquid crystal display appears to display information in full color.

The gate driving signals processed in the single integrated PCB 260 areinput into all the gate lines 241 via the double functioning tapecarrier package 226, the gate tape carrier package 210, and the gatedriver IC 212.

Then, the transmission pattern and the transmission lines applied to theTFT substrate 240, the gate tape carrier package 210, the dualfunctioning tape carrier package 226 are formed in a very small spacewith a fine pitch. This fine pitch pattern and line may form a RC timedelay circuit due to a very high resistance of the substrate and theparasitic capacitance formed between the gate transmission lines.

The RC time delay circuit may also cause the turn-on voltage Von and theturn-off voltage Voff of the gate driving signals to be modulated. Adelay in transmission of the gate driving signals degrade the picturequality, causing flickers in the effective display region of the paneland a divisional appearance on the effective region of the panel.

Moreover, the modulation in the turn-on voltage and the turn-off voltageaffects the gray scale voltage being input into the data lines 242,resulting in a variation in the corresponding gate driving signal linegroups 281, 282, and 283 into the respective corresponding gate driverICs 212. Here, it is natural for the single integrated PCB 260 to haveadditional output terminals A, B, and C which are connected to therespective gate driving signal transmission groups.

Specifically, the first gate driving signal lines group 283 is connectedto the first gate driver IC of the first gate tape carrier package, thesecond gate driving signal line group 282 is connected to the secondgate driver IC of the second gate tape carrier package, and the thirdgate driving signal line group 281 is connected to the third gate driverIC of the third gate tape carrier package.

In other words, the plurality of gate driving signal transmission linesare grouped into several groups and respective groups are connected tocorresponding gate driver ICs in parallel, thereby minimizing the RCtime delay during the transmission of the gate driving signals andpreventing the flicker and picture division appearance.

As another embodiment, upon considering the length of the respectivegate driving signal lines from the single integrated PCB 260, the firstgate driving signal line group 281 is longer than the second gatedriving signal line group 282. And the second gate driving signal linegroup 282 is longer than the third gate driving signal line group 283.In the above constitution, since resistance of the lines groups isproportional to the length, the first gate driving signal lines group281 has the biggest resistance when the diameter of the lines of therespective groups are the same. Therefore, in order to prevent RC timedelay due to a difference in the resistance between the three gatedriving signal lines, the diameter of each of signal transmission linesof the first gate driving signal line group is bigger than the secondgate driving line group and the diameter of each of signal transmissionlines of the second gate driving signal line group is bigger than thethird gate driving line group.

Another embodiment to prevent the flicker and the picture divisionappearance phenomena applies respective gate driving signalscorresponding to the respective gate driving signal line groups 281,282, and 283 to the corresponding gate driving signal line groups 281,282, and 283 with a time interval. A first gate driving signalcorresponding to the first gate driving signal line group 281 is firstapplied to the first gate driving signal line group 281. A second gatedriving signal corresponding to the second gate driving signal linegroup 282 is secondly applied to the second gate driving signal linegroup 282 after a first predetermined time elapses after sending thefirst gate driving signal. Then, a third gate driving signalcorresponding to the third gate driving signal line group 283 is finallyapplied to the third gate driving signal line group 283 after a secondpredetermined time elapses after sending the second gate driving signal.The first and second predetermined time is determined by respectiveresistance values calculated considering the lengths and diameters ofthe first, second, and third gate driving signal line groups 281, 282,and 283.

As still another embodiment to prevent the flicker and the picturedivision appearance problems, respective gate driving signal line groups281, 282 and 283 are electrically connected to respective correspondinggate driver ICs in parallel and a turning resistor that controls thetiming of the gate driving signals is connected to the respective gatedriving signal line groups 281, 282, and 283 or the single integratedPCB 260.

Specifically, Voff signal that turns off the thin film transistor provesto be sensitively affected by the substrate resistance and the signaltransmission patterns. As described previously, since the substrateresistance and the pattern resistance are determined by the total lengthand the diameter of the gate driving signal line groups 281, 282, and283, the gate driving signal line groups have different signal arrivingtime, generating the flicker and the picture division appearanceproblems and degrading the picture quality.

Therefore, the single integrated PCB 260 generates the Voff signalconsidering maximum resistance among the resistances applied to the gatedriving signal line groups 281, 282, and 283.

However, although the Voff signal is input into respective gate driverICs through the respective corresponding gate driving signal line groups281, 282, and 283 considering the maximum resistance, the final Voffsignal still has a deviation due to the resistance. Accordingly, inorder to eliminate the deviation, a turning resistor is provided.

The turning resistor is respectively formed in each of the gate drivingsignal line groups 281, 282, and 283 and enables to output a Voff signalwith a minimum deviation, thereby eliminating the flicker and thepicture division appearance problems.

Next, a method for operating the LCD panel according to the abovepreferred embodiments is described.

First, the single integrated PCB 260 generates a gate driving signal anda data driving signal. The data driving signal is transformed into asource signal including a gray scale voltage through the dualfunctioning data tape carrier package 226 and the single functioningdata tape carrier package 229. The source signal is then applied to thedata line group 246.

The gate driving signals from the single integrated PCB 260 areconcurrently input to all the gate driver ICs 212 of the gate tapecarrier packages 210 through the first gate driving signal line group281 to the third gate driving signal line group 283.

The first corresponding gate driving IC receives a first gate drivingsignal from the single integrated PCB 260 through the third gate drivingsignal lines group 283 and then applies Von signals to gate lines inportion of “I” of the effective display region in FIG. 5 using OEsignal. The image of the portion “I” is maintained for one frame.

The second corresponding gate driving IC receives a second gate drivingsignal from the single integrated PCB 260 through the second gatedriving signal line group 282 and then applies Von signals to gate linesin portion “II” of the effective display region in FIG. 5. The pictureof the portion “II” is also maintained for one frame together with thepicture of the portion “I”.

The third corresponding gate driving IC receives a third gate drivingsignal transmitted from the single integrated PCB 260 through the firstgate driving signal line group 281 and then applies Von signals intogate lines in portion “III” of the effective display region in FIG. 5.The picture of the portion “III” is also maintained for one frametogether with the picture of the portion “I” and portion “II”.

Because these steps are performed very quickly, it may display a movingpicture or a clean still picture on the panel.

The liquid crystal display panel according to the present invention doesnot need a gate PCB and only the gate tape carrier packages 210 arecoupled to the ends of the gate lines 241 formed on the TFT substrate240.

Thus, these gate tape carrier packages 210 are bent and then attached tothe rear surface of the TFT substrate 240 as shown in FIGS. 6 and 7.This would produce a compact liquid crystal display panel.

FIG. 8 is a partial sectional view that can be handled easily showing apart of a liquid crystal display according to the present invention.

Referring to FIG. 8, a backlight assembly 300 includes a mold frame 350.The mold frame 350 receives a light reflecting plate 340, a lightguiding plate 320, and optical sheets 310 in the named order. The liquidcrystal panel of the present invention is mounted on the optical sheets310 and the perimeter region of the liquid crystal panel 200 is fixed bya chassis 400.

Here, a tape carrier package 210 one end of which is connected to theTFT substrate 240 is bent and a gate driver IC 212 of the tape carrierpackage 210 is attached to the rear surface of the TFT substrate 240 bya fixing means such as a double sided adhesive tape, an adhesive, or aclip.

The mold frame 350 has a receiving groove 350 a that can accommodate thetape carrier package 210.

Meanwhile, although the above described embodiments show and describethe tape carrier packages of the above-described configurations, a chipon flexible (COF) having more flexible base film than the base film ofthe flexible printed circuit may be also used.

Also, although FIG. 4 shows and describes that the gate driving signaltransmission pattern 223 is integrated together with both of the datadriving signal input pattern 224 and the data driving signal outputpattern 225 on the data tape carrier package 226 of FIG. 4, only thegate driving signal transmission pattern 223 may be formed on anindependent flexible base no having a driving chip.

As described above, the present invention can provide a compact sizeliquid crystal display by integrally processing gate and data drivingsignals using a single integrated PCB.

Moreover, using the single integrated PCB may eliminate the connectorand a flexible printed circuit that is used for connecting two PCBs. Asa result, spaces for the connector and the flexible printed circuit canbe saved. Also, the whole assembly process is simplified.

While the present invention has been described in detail, it should beunderstood that various changes, substitutions and alterations can bemade hereto without departing from the spirit and scope of the inventionas defined by the appended claims.

1. A signal transmission system of display apparatus, comprising: a data signal transmission pattern that transmits a data signal from a single integrated printed circuit board (PCB) to a data line formed on a display panel; and a gate signal transmission pattern that transmits a gate signal from the single integrated printed circuit board (PCB) to a gate line formed on the display panel wherein the data signal transmission pattern is formed on a flexile printed circuit (FPC) having a first end coupled with the display panel and a second end coupled with the single integrated printed circuit board (PCB).
 2. The signal transmission system of claim 1, wherein the flexible printed circuit (“FPC”) is electrically connected to the display panel through an anisotropic conductive film.
 3. The signal transmission system of claim 1, wherein the flexible printed circuit (FPC) is electrically connected to the printed circuit board (PCB) through an anisotropic conductive film.
 4. The signal transmission system of claim 1, wherein the gate signal transmission pattern is formed on a flexible printed circuit (FPC) having a first end coupled with the display panel and having a gate driver IC formed thereon.
 5. The signal transmission system of claim 4, wherein the gate signal transmission pattern is electrically coupled with the single integrated printed circuit board (PCB) through a connection wiring formed on the display panel.
 6. The signal transmission system of claim 5, wherein the gate signal transmission pattern comprises: an input pattern formed on the flexible printed circuit (FPC) and having a first line group and a second line group; an output pattern formed on the flexible printed circuit (FPC) and electrically connected to the first line group through the gate driver IC; and a relay pattern formed on the flexible printed circuit (FCP) electrically connected to the second line group.
 7. The signal transmission system of claim 6, wherein the relay pattern is not electrically connected to the gate driver IC.
 8. The signal transmission system of claim 7, wherein the relay pattern is electrically connected to the second line group at a region of a flexible film of the flexible printed circuit, which is opposite to the output pattern with respect to the gate driver IC.
 9. The signal transmission system of claim 6, wherein the relay pattern is electrically connected to the second line group directly.
 10. The signal transmission system of claim 5, wherein the connection wiring is formed at a corner of the display panel.
 11. The signal transmission system of claim 4, wherein the flexible printed circuit is electrically connected to the display panel through an anisotropic conductive film.
 12. The data transmission system of claim 1, wherein the display panel is a liquid crystal display panel.
 13. The data transmission system of claim 1, wherein the gate signal transmission pattern and the data signal transmission pattern are formed on a flexible printed circuit (FPC) board and the gate signal is applied from the gate signal transmission pattern to the gate line through a gate flexible printed circuit.
 14. The data transmission system of claim 1, wherein a gate flexible printed circuit is between the gate signal transmission pattern and the gate line. 